After their parents died, grief turned Eric into an alcoholic who never worked, always relying on his sister Y/N for money. She has carried everything alone ever since — until her best friend Brittany gets her a job at an exclusive underground club. By day, she is the hardworking Y/N; by night, she becomes Sin, the club’s mysterious, alluring star — and only Brittany knows the truth. When Ben, Eric’s best friend and a professional boxer, returns to town, he secretly slips into the club. He is captivated by Sin, never guessing she is the same Y/N he has loved silently for years. Every secret is carefully hidden… but how long can the mask stay on?